High-speed grinding-mill.



I. S. FASTING.

- HIGH SPEED' cmwnme MILL.

APPLICATION FilUID JUNE 5,1914. 1 1 %,,@%1 Patented May 30,1916.

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w/msssts J. S. FASTING HIGH SPEED GRINDING MILL.

APPLICATION FILED JUNE 5.19M.

Patented May 30,1916.

'3 SHEETS-SHEET 2- l. S. FASTING.

HIGH SPEED GRINDING MILL.

APPLICATION FILED gun: 5.1914.

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0 3 W M d e m Au t nu P IN VE/V TOR WITNESSES JOHAN FASTING, 01E FIQEDERIKSBERG, NEAR COPENHAGEN, DENMARK, ASSIGNOB TO 15. L. SMIIDTH & 00., OF NEW YORK, N.

Y., A CORPORATION OF NEW JERSEY.

HIGH-SPEED GRINDING-MILL.

Specification of Letters Patent.

Patented May 30, 1916.

Application filed June 5, 1914. Serial No. 843,143.

To all whom it may concern Be it known that I, JoHAN a subject of the King of Denmark, residing in Frederiksber near Copenhagen, Den.- mark, have invented certain new and useful Improvements in High Speed Grinding- Mills, of which the following is a specification, reference being had to the accompanying drawings, which form a part hereof.

This invention relates to high speed grinding mills in which are employed grinding bodies in the form of rollers or the like and by which a crushing action between the surfaces of the rollers and the inner wall of the mill is secured, as distinguished from mills in which are employed grinding balls or the like in which the material is subjected to a constant pounding from the. grindiiig bodies. Inhigh speed mills it is desirable to increase the velocity of the drum to a point where the centrifugal force upon the material to be groundexceeds the action of gravity thereon so that the material is carried around with the drum and covers the grinding surface in a continuous layer. Where grinding bodies in the form of rollers are used in a mill of this character the passage of the material through the drum is so slow as to reduce appreciably the capacity of the mill.

It is an object of this invention to provide a high speed mill in which, rollers may be employed for the purpose of crushing the material against the inner wall of the drum and to mount or arrange these rollers with respect to the inner surface of the drums so that the rollers themselves shall serve to carry the material through the drum. In-

S. FAs'riNo,

cidental to this carrying action of the r0ll- 61's the material is subjected, in addition to the crushing action, to constant abrasions from the rollers due to the relative longitudinal movement between the material and the rollers. This additional abrading action materially increases the capacity of the mill, as will be understood.

By the improvements described herein it becomes possible to operate a grinding mill at very high speed and to increase its capacity to a maximum since the mill isnot subjected to a formation'of rings and the material is constantly impelled through the mill by the rollers. Moreover, the present invention prolongs the .life of the mill inasmuch as it eliminates the use of scrapers or the like which ordinarily subject the mill to excessive wear. In accordance with the invention the grinding rollers or the like .are disposed within the mill with their axes angularly disposed with respect to the axis of the drum. 7 The invention will be described more particularly with reference to the accompanying drawings in which Figure l is a view partly in horizontal section taken through a mill provided with the present improvement, the driving device for the mill and the grinding body being shown in plan. Fig. 2 is a view similar to Fig. l and showing another form of grinding body. Fig. 3 is a view substantially similar to Fig. 2 and showing a grinding mill of a slightly modified form. Fig. 4 is a fragmentary view partly in horizontal section and partly in plan of a mill provided with a, series of grinding bodies constructed and arranged in accordance with the present invention. Fig. 5 is a view partly in horizontal section and partly in plan of still another form of grinding mill provided with a series of grinding'rollers mounted in accordance with the present invention, the

rollers being shown in inoperative position.

Fig. 6 is a view similar to Fig. 4 but showing other forms of grinding rollers positioned with respect to each other by some- What modified devices.

The grinding mill '1 may be driven through a shaft 2 secured to the end wall thereof and having fixedthereon a pulley 3 which may be driven by any available source of power. The shaft 2 may be mountedin bearings 4: whereby the entire mill is supported. The material to be crushed may be fed into one end wall of the mill through an opening 1 by devices not illustrated and may be discharged adjacent the other end of the mill through suitable peripheral openings 8, all in the usual manner. lVithin the drum rests loosely a grinding roller 5 which may be of many different forms, ylindrical, conical, elliptical, polygonal, etc., as will hereinafter appear. This roller has secured thereto a shaft 6 which extends through the opening 1 to a point without the drum and is provided at its outer end with a ball and socket connection with a bearing 7, whereby .free movement of the shaft 6 in any lateral plane may occur while am'al movement t ereof is prevented positively. The shaft 6 ismounted angularly with respect to the -ax1sof the milll so that the grinding roller does not rest with itsgrinding face parallel to "the inner wall of the drum.

In the operation of the mill it is rotated in the direction of the arrow and causes r0- tation of the grinding roller'5 in the direction indicated by the arrow 10, the grindlng roller engaging the inner wall of the drum and serving to crush. between it and sald inner wall, the material introduced into the mill. By reason of the angular disposition of the roller 5 with respect to the drum, the tendency of the roller is to creep toward the feed end of the mill. This tendency is re-' sisted positively by the bearing 7 of the shaft 6 and such movement of the roller 5 is prevented. The action of this roller on the material between it and the inner wall of the drum is such as to move the material through the mill by the crushing bodies.

- shape. Extending It will be evident that the material will tend to collect'at each end of the mill where it is out of the path of the grinding body and to prevent this deposit the inner wall of the mill may be formed of the general outline indicated by the reference characters 11 and 12 at the portions of the wall of the mill where the material tends to collect.

The construction of all of the parts shown in Fig. 1 is substantially the same in the embodiment illustrated in Fig. '2 save that the outer surface of the crushing roller 5 is of conical shape. The action between the grinding roller, the material and the wall of the mill remains the same as in the operationof the form shown in Fig. 1. p

In Fig. 3, the side wall of the mill 1 is given a conical shape, which may be desirable under some conditions of use, and with this conical wall coiiperates in the manner before described, the conical roller 5.

In Fig. 4, the mill 1 itself is of cylindrical form and 'has disposed therein a series of grinding rollers 5 which may be of any shape within the. scope of this invention. As illustrated, these rollers are of a conical through the rollers isa shaft 15 which carries hemispherical bearings 14 to engage the ends of the respective crushing rollers 5 and prevent axial movement thereof within the mill while permitrollers with interior conical. openings 13 through which the shaft extends. It is to be understood, that the shaft 15 is connected at its free end with such a shaft as is indicated bv the reference character 6, which has an end bearing similar to the end hearing 7 all as described, in connection with Figs. l3. The operation of the mill shown in Fig. 4 and the action of the grinding rollers is the same as before described.

In Fig. 5, the mill 1 has its side wall. formed with a series of continuous conical sections in stepped relationship to each other. Within each of these conical portions is disposed a grinding roller 5 of any suitable form and having one face in engagement with a hemispherical bearing 14 carried on a central shaft 15, as in Fig. 4:. Each 1 of the rollers 5 has extending therethrough a conical opening 13 to permit the rollers to assume angular positions with respect to the axis of the drum when the drum is rotated. The figure under discussion shows the mill in inoperative condition, and the grinding borlllies resting loosely in the bottom of the m1 shaft 6 with its end bearing 7, have been eliminated and the grinding rollers 5 are maintained in their angular position with In Fig. 6, the central shaft 15 and thrust' respect to the axis of the mill 1 by means of short shafts 15 formed on each .end of each.

of, the grinding bodies and concentrically with respect thereto. These shafts 15 on the adjacent. rollers 5 abut against each other and maintain each-other in angular relation to the side wall of the mill 1. In this embodiment of the invention, endwise movement of the grinding bodies toward the feed end of the drum may be prevented in any manner desired. Thus, for instance, the mill 1 may be provided with an annular flange against which the end roller mayabut and thus prevent the other. rollers from moving longitudinally of the mill. Or, if desired, the end roller may be provided with a shaft similar to the shaft 6 which may extend without the drum and rest in an end bearing 7. Other ways of preventing the longitudinal movement of the rollers within the drum may be devised by those sln'lled in the art without departing from the spirit of 7 this invention. Another feature of mterest in connection with the embodiment illustrated'in Fig. 6 and which feature may be employed as well in the other forms shown, resides in the construction of the inding bodies 5. Each bod has-"end sks 18 united each with each' y a concentric shaft 17, and between these end disks18 are disposed a series of rings 16, the peripheries of which engage the material to be crushed. These rings 16 may be mounted loosely with respect to the shaft 17 and, as indicated before, may assume any form or size desired.

From the many different forms of apparatus shown herein for carryin out the present invention it-is believed it will be understood that modifications thereof may be made readily by those skilled in the art Without departing from the scope and spirit of the invention which broadly resides in the provision of crushing members adapted to impel the material to be crushed, through the rotating mill.

I claim as my invention 1. In combination with a high speed grinding mill, a grinding body disposed loosely therein and rotatable about its own axis only under the influence of the rotating mill about an axis extending longitudinally thereof, said axis being angularly disposed in a horizontal plane With respect to the axis of the mill'durin the operation of the mill and means to afiord universal movement of the grinding body. 0

2. In combination With a high speed grinding mill, a grinding body disposed loosely therein and rotatable about its own axis only under the influence of the rotating mill about an axis extending longitudinally thereof, said axis being angularly disposed in a horizontal plane with respect to the axisof the mill during the operation of the mill, means to prevent bodily movement of the grinding body longitudinally of the mill and means toafford universal movement of the rinding body.

3. In com ination with a high speed grinding mill, a series of grinding bodies disposed loosely therein longitudinally of,

the mill and rotatable respectively about their own axes only under the influence of the rotating mill, the axes extending longitudinally of the grinding bodies, means to prevent bodily movement of the grinding bodies longitudinally of the mill and means to afford universal movement of each of the grinding bodies independent of one another.

4. In combination with, a high speed grinding mill, a series of grinding bodies disposed loosely therein longitudinally of the mill and rotatable respectively through rotation of the mill about axes extending longitudinally of them, bodies having central openings, a shaft extending through the central openings in each of said bodies and longitudinally of the mill and bearings carried by said shaft to engage each of said bodies respectively to prevent longitudinal movement thereof in the mill, said bearings permitting said bodies to assume positions each independent of the other inwhich the geometrical axis of each is angularly disposed with respect to the axis of the mill during the operation of the'mill.

This specification signed and witnessed this 20th day of May A. D., 1914.

JOHAN S. FAS'JJING:w

Signed in resence of Axum ERMIN, ll. KNUDSEN. 

